Apologies if this problem exists already but I searched and found similar but not quite the same.
I have 2 light fittings in my lounge, each has a 4 halogen bulb fitting attached, 4xGU10 in each. There's currently 1 switch which turns both fittings and all 8 bulbs on and off. I want to replace with 2 dimmers so each bank can be dimmed or on or off independently.
In the back of the old switch there are two wires coming in. Each with a red, a black and a yellow/green wire. The yellow/green are wired to the back of the fitting. The black wires were together in a connector block and 1 of the reds was in common and the other in L2 in the switch.
I replaced with a 2 gang 2 way 400W dimmer. The instructions said to wire black to common and red to L2 so this is what I did, separating each wire to one of the two gangs, and leaving the earths as they were.
When I turned on the power, there was a loud pop and spark at the switch and the fuse in the RCD blew.
I'd be grateful for any advice, preferably not just "get an electrician in" but beggars can't be choosers!
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!